Bar clamp extension fixture



FIG. 1 is a front, top and right side perspective view of the bar clamp extension fixture showing my new design;

FIG. 2 is a front elevational view of the design;

FIG. 3 is a top plan view of the design;

FIG. 4 is a right side elevational view of the design; and,

FIG. 5 is a rear elevational view of the design. 

The ornamental design for a bar clamp extension fixture, as shown and described. 